It is obvious _________bike-sharing has a future in China.
A. what B. that C. where D. if
B
You don’t have to ________. No one can hear us.
A. whisper B. struggle C. argue D. apologize
A
How life began on earth is a ___________that scientists found hard to solve.
A. discovery B. system C. belief D. puzzle
D
We should develop healthy eating habits to ______a strong body.
A. take up B. make up C. build up D. set up
C
It was ________ of John to turn off the TV when I was sleeping in the bedroom.
A. careless B. honest C. humorous D. considerate
D
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